US3753163A - Electromagnetic wave-elastic wave transducer and method - Google Patents

Electromagnetic wave-elastic wave transducer and method Download PDF

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Publication number
US3753163A
US3753163A US00211976A US3753163DA US3753163A US 3753163 A US3753163 A US 3753163A US 00211976 A US00211976 A US 00211976A US 3753163D A US3753163D A US 3753163DA US 3753163 A US3753163 A US 3753163A
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Prior art keywords
wave
medium
elastic
magnetic field
electromagnetic
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US00211976A
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English (en)
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F Morgenthaler
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CHU ASS INC US
CHU ASSOCIATES
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CHU ASSOCIATES
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Assigned to BAYBANK MIDDLESEX reassignment BAYBANK MIDDLESEX LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: CHU ASSOCIATES, INC. A CORP. OF MA
Assigned to LIQUID CRYSTAL TECHNOLOGY, INC., reassignment LIQUID CRYSTAL TECHNOLOGY, INC., SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAVIS, FREDERICK
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils

Definitions

  • the present invention relates to electromagnetic wave-elastic wave transducers and methods, being particularly directed to such devices involving magnetoelastic media, such as YIG crystals and the like.
  • An object of the invention is to provide a new and improved method of transducing and an improved transducer structure, particularly adapted for YIG and similar magneto-elastic structures, that enables use with extremely high X-band microwave frequencies and increased powers.
  • a further object is to provide a novel transducer of more general utility, as well.
  • the invention in one of its aspects, involves the provision of tunneling spin-wave conversion (electromagnetic-to-spin wave energy) and spin wave-toelastic wave conversion in successive transduction layers near an end of a magneto-elastic medium. Preferred constructional details are hereinafter discussed.
  • FIGURE is a greatly magnified side elevation of a preferred construction embodying the invention, with operational wave forms illustrated thereupon to describe the performance.
  • a YIG or similar magnetoelastic medium including Ga-doped YIG, Mn-doped YIG, Mn-Ga-doped YIG, Eu-doped YIG, Li-ferrite, as illustrations, is shown at 2, provided at its opposite ends with similar terminal transducing structures 1 and 1', respectively connected with electromagnetic-wave energy conductors, illustrated and described herein generically as antenna or probe structures 3 and 3 for the input and output transmission of electromagnetic currents.
  • a steeply decreasing magnetic field profile A is set up through the transducer layer 1, leveling off through the medium 2 at B, and steeply rising at the other transducer end 1', as shown at C.
  • the transducing regions I, and I and the regions A and C will, as later explained, preferably be very thin terminal layers of the relatively long medium 2, enabling high frequency and high power operation.
  • the antennas at 3 and 3' may be thin wires or thin deposited strips or conductors.
  • a novel transducing operation can be achieved by appropriate orientation and value of a bias magnetic field H applied axially along the medium 2, in this example, to intersect the steeply decreasing and steeply rising magnetic field profile end characteristics A and C at intermediate points P and P, respectively.
  • the region R represents the layer where the region l of the steeply decreasing or falling profile portion .A applies; and successive adjacent regions R and R correspond to regions [I and III of the field profile portion A.
  • the value of H is selected so as to achieve cut off of the electromagnetic wave input at 3 over the region R,, and suppression of any possible conversion of the electromagnetic energy to spin waves therein.
  • the wavelength of the spin waves (SW) will decrease with decreasing amplitude as they are propagated through the region R as shown, under the decreasing field characteristic II of the magnetic field profile portion A, until the point P" of the medium is reached at which the wavelength is sufficiently decreased to effect splitting conversion from spin waves (SW) to elastic waves (ELW), which are then propagated through the next adjacent region R (where the magnetization profile portion Ill applies), and thence into and through the medium 2.
  • the successive regions R R and R should have successively increasing saturation magnetization. This may be effected, for example, by growing epitaxial YIG layers at this end of the YIG medium 2 (and at the other end 1 introducing successively increasing amounts of, for example, gallium doping to replace progressively more iron in the YIG. Such doping, while not previously effected for these purposes, may be accomplished, for example, by techniques such as described in Magnetic Effects of Indium and Gallium Substitutions in Yttrium Iron Garnet", Anderson et al., Journal of the Physical Society of Japan, Vol.
  • the epitaxial growth technique for forming the layers may be carried out in serveral ways including chemical vapor deposition and molten dipping.
  • yttrium chloride, iron chloride andthe like have been mixed within a quartz tube furnace and vapor-deposited at high temperature on a Gd-Ga garnet substrate to produce the desired depositions.
  • the chemical constituents are prepared in molten form and the substrate is suecessively dipped therein to build up the layers.
  • a method of transducing electromagnetic waves into elastic waves and vice versa that comprises, producing a magnetic field profile along a magneto-elasticwave supporting medium that steeply decreases at one end and increases at the other end; contacting electromagnetic wave antennae to the said ends of the medium; applying a bias magnetic field to the medium and adjusting the value and orientation thereof to cause its magnetic field operating-level line to intersect the steeply decreasing and increasing portions of the magnetic field profile at intermediate points of such portions such that, as the electromagnetic wave launches into the medium at said one end, it initially encounters in a first region preceding the said intermediate point, both electromagnetic-wave-cutoff and spin wave-conversion-suppression, forcing tunneling through said first region to the next adjacent region at which conversion to spin waves of successively decreasing wavelength occurs, which, in turn, are propagated to a further adjacent region of said steeply decreasing profile portion at which the wavelength has become sufficiently small to effect conversion from spin-wave to elastic-wave energy; and propagating the elastic wave energy into the medium; with the reverse conversion operation occuring at the said other end
  • a method of transducing between electromagnetic waves and elastic waves that comprises, producing a steeply changing magnetic field profile at an end of a magneto-elastic-wave supporting medium; contacting an electro-magnetic wave antenna to said end of the medium; applying a bias magnetic field to the medium of such direction and valve that its magnetic field operating-level line intersects the steeply changing profile at an intermediate point thereof defining a first region thereof, where electromagnetic wave energy is cutoff and spin-wave conversion thereof is suppressed to force tunneling through said first region, with conversion to spin waves of successively changing wavelength occuring along the next adjacent region of the steeply changing profile up to the point where such wavelength is sufficiently small to effect conversion between spin wave and elastic wave energy; the elastic wave energy being supported in the medium adjacent the said end.
  • An electromagnetic wave-elastic wave transducer having, in combination, a magneto-elastic-wave supporting medium provided at one end with an electromagnetic wave antenna, means for establishing at said one end a magnetic field profile that steeply changes over a narrow portion of the medium near said one end, means for applying a bias magnetic field to the medium of such direction and value that its magnetic field operating-level line intersects the steeply changing profile at an intermediate point defining a first region thereof followed by second and third adjacent regions of the steeply changing profile, the field being adjusted to produce spin electromagnetic-wave cutoff and spin wave conversion suppression along the said first region to force tunneling therealong, with conversion to spin waves of successively changing wavelength along the said second region and with the third region disposed where such wavelength is sufficiently small to effect conversion between spin wave and elastic wave energy; the medium adjacent said one end supporting the elastic wave energy therein.
  • An electromagnetic wave-elastic wave transducer as claimed in claim 4 and in which the means provided to produce said steeply changing magnetic profile comprises a further medium disposed adjacent the firstnamed medium but of different saturation magnetizat a t a a

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US00211976A 1971-12-27 1971-12-27 Electromagnetic wave-elastic wave transducer and method Expired - Lifetime US3753163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21197671A 1971-12-27 1971-12-27

Publications (1)

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US3753163A true US3753163A (en) 1973-08-14

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US00211976A Expired - Lifetime US3753163A (en) 1971-12-27 1971-12-27 Electromagnetic wave-elastic wave transducer and method

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US (1) US3753163A (OSRAM)
JP (1) JPS4877785A (OSRAM)
FR (1) FR2166104A1 (OSRAM)
GB (1) GB1382160A (OSRAM)
IT (1) IT972967B (OSRAM)
NL (1) NL7217679A (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918012A (en) * 1973-08-03 1975-11-04 Commissariat Energie Atomique Method and device for providing a variable delay line

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5136175B2 (ja) * 2008-04-11 2013-02-06 日本電気株式会社 周波数変換器および周波数変換方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249882A (en) * 1962-12-17 1966-05-03 Gen Electric Spin and phonon spin traveling wave parametric amplifiers and spin wave delay lines
US3309628A (en) * 1965-05-07 1967-03-14 Teledyne Inc Yig broadband variable acoustic delay line
US3353118A (en) * 1964-05-19 1967-11-14 Teledyne Inc Magnetostatic wave variable delay apparatus
US3444484A (en) * 1967-04-03 1969-05-13 Raytheon Co Solid state delay line for propagation of microwave frequency energy in spin wave mode
US3530302A (en) * 1967-06-14 1970-09-22 Massachusetts Inst Technology Method of and apparatus for changing frequency power and/or delay time of wave energy
US3668568A (en) * 1969-10-06 1972-06-06 Chu Associates Signal processing apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249882A (en) * 1962-12-17 1966-05-03 Gen Electric Spin and phonon spin traveling wave parametric amplifiers and spin wave delay lines
US3353118A (en) * 1964-05-19 1967-11-14 Teledyne Inc Magnetostatic wave variable delay apparatus
US3309628A (en) * 1965-05-07 1967-03-14 Teledyne Inc Yig broadband variable acoustic delay line
US3444484A (en) * 1967-04-03 1969-05-13 Raytheon Co Solid state delay line for propagation of microwave frequency energy in spin wave mode
US3530302A (en) * 1967-06-14 1970-09-22 Massachusetts Inst Technology Method of and apparatus for changing frequency power and/or delay time of wave energy
US3668568A (en) * 1969-10-06 1972-06-06 Chu Associates Signal processing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918012A (en) * 1973-08-03 1975-11-04 Commissariat Energie Atomique Method and device for providing a variable delay line

Also Published As

Publication number Publication date
GB1382160A (en) 1975-01-29
NL7217679A (OSRAM) 1973-06-29
FR2166104A1 (OSRAM) 1973-08-10
IT972967B (it) 1974-05-31
JPS4877785A (OSRAM) 1973-10-19

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Owner name: LIQUID CRYSTAL TECHNOLOGY, INC.,

Free format text: SECURITY INTEREST;ASSIGNOR:DAVIS, FREDERICK;REEL/FRAME:003904/0399

Effective date: 19810723

Owner name: BAYBANK MIDDLESEX, SEVEN NEW ENGLAND EXECUTIVE PAR

Free format text: LICENSE;ASSIGNOR:CHU ASSOCIATES, INC. A CORP. OF MA;REEL/FRAME:003917/0324

Effective date: 19810724